Hydrochloric Acid → cis-4-amino-5-chloro-2-methoxy-N-[3-methoxy-1-[4-(methylamino)butyl]-4-piperidinyl]benzamide

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Reaction Steps

A mixture of (1,1-dimethylethyl) cis-[4-[4-[(4-amino-5-chloro-2-methoxybenzoyl)amino]-3-methoxy-1-piperidinyl]butyl]methylcarbamate and 250 parts of 2-propanol, saturated with hydrochloric acid was stirred and refluxed for 15 minutes. The reaction mixture was evaporated and the residue was taken up in trichloromethane. The organic layer was washed with water, saturated with ammonium hydroxide, dried, filtered and evaporated. The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol, saturated with ammonia, (95:5 by volume) as eluent. The pure fractions were collected and the eluent was evaporated. The residue was crystallized from acetonitrile. The product was filtered off and dried, yielding 33 parts (78.7%) of cis-4-amino-5-chloro-2-methoxy-N-[3-methoxy-1-[4-(methylamino)butyl]-4-piperidinyl]benzamide; mp. 129.3° C. (interm. 9).

Provenance & Evidence